Headlight.



0. WINSTON.

HEADLIGHT.

APPLICATXON FILED OCT-5.19l6.

1 ,273,970. Patented July .30, 1918.

rY/ T/YESSES //vv/Y 7'02 E6 01 6/1 00 )7/0620/7 B) H/6 A T70E/YEY5 MM weOVEBTON WINSTON, OF MINNEAPOLIS, MINNESOTA.

HEADLIGHT.

' Specification of Letters Patent.

Patented Jul 30, 1918.

Application ma October 5, 1916. Serial No. 123,848.

To all :whom it may concern:

Be 1t known that I, OvEnToN WINSTON,

a citizen of the United States, residing at- Minneapolis, in the countyof Hennepin and State of Minnesota, have invented certain new and usefulIm rovements in Headlights; and I do here ydeclare the following to be afull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame. a

Particularly, my invention relates to headlights provided with shiftinlight sources within concave reflectors, an the invention provides, incombination therewith, a frosting or light dimming obstructing surfaceof novel relative arrangement, all as will hereinafter more fullyappear.

The invention is illustrated in the accompanying drawings wherein likecharacters indicate like parts throughout the several views. Referringto the drawings:

Figure 1 shows the reflector in vertical section and a two-filamentlight bulb in side elevation; and

Fig. 2 is a front elevation of the headlight, parts-'ofthe reflectorbeing broken away; v

The, reflector is indicated by the numeral 1 andtlie 1i ht bulb b thenumeral 2. This light bulb as two aments, the hot spots of which areindicated, one at a and the other at b. The hot spot of filament a is atthe axis of the reflector and the hot spot of the filament. b isvertically offset and materially above the axis of thereflector.

In practice, the two filament light bulb employed may be and preferablyis" combined with electrical connections and switches, such, forexample, as; illustrated inmy pending application, S. N. 86,852, filedMarch 27, 1916, and entitled Headlights.

In Fi 1, line 0 radiates from 5.150 the upper e ge of the reflector;line (1 is a horizontal line or line parallel to the axis of thereflector and whichintersects point b, and line e is a line that mdiatesfrom b at an upward inclination to line d and about midwa between linesa and d.

e globe of the light bulb 2 is provided with a. frosting or lightdimming surface 3 on its upper front portion. When the bulb globe is shelical, this frosting 3 will be truly circu ar, but in anymse it hasa'margin that lies in a single plane so that it may,

for example, be produced by dipping in a liquid which has a chemicalaction on glm. The lower edge of the frostin 3 extends down to ahorizontal line d whifie the upper edge thereof extends to the line e.

For long beam projection, such as required for country road driving, thelight source will be at filament a, while for city driving, whereobjection-able blinding must be avoided, the light source will be atfilament 1). \Vith this arrangement, when the light source is at b, allof the direct rays which are in a vertical plane and above thehorizontal line d and below oblique line e,

will be dimmed by frosting 3. The-direct rays from b which are in avertical plane betwen lines 6 and c are not dimmed, but have such upwardangular projection that they will not strike the eyes of a person in apassing machine until the assing machine is so close that the rays W111be from one side and not directly in the line of vision of a personin apassing machine,-and hence,

will not produce serious blinding effect.

The frosting above described is about the smallest size capable of usefor the prevention of serious blinding effects and has the furtheradvantage that it may be produced by dipping. The said frosting, becauseof its smallness and relative location, will produce a minimum shadoweffect in the long projected beam from source a.

What I claim is:

In a headlight, the combination with a reflector, of, a two-filamentlight bulb therein, said bulb having two filaments,one at the axis andthe other above the axis of said reflector, and the globe of said bulbhaving.

said upper filament horizontally or parallel to the axis of saidreflector.

In testlmony whereof I aflix my signature in presence of two witnesses.

OVERTON WINSTON.

